unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Btn_1: TButton;
    procedure Btn_1Click(Sender: TObject);
    procedure FormShow(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Btn_1Click(Sender: TObject);
var
  S,S1:string;
begin
  s:='aaa';
  s1:='bbb';
 asm
  push 0;
  push s;
  push s1;
  push 0; 
  call Messagebox;
 end;
end;

procedure TForm1.FormShow(Sender: TObject);
begin
  Self.Caption:='Call MessageBox';
end;

end.
